Beiträge zu einer Monographie der paläarktischen Isosominen 49 
„Female. -—- Length, 3,6 mm; expanse, 6 mm. Pronotum and 
mesonotum minutely but strongly rugose, smoother than I. tritici; 
metanotum more coarsely rugulose, the larger elevations taking 
a longitudinal direction, no central furrow or carina; pronotal 
spot very small, not visible from above. Abdomen as long as head 
and thorax together; joints 4, 6, and 7 subequal in length, the fifth 
a little longer; joint 3 a little longer than 4; 2 hardly longer than 
3 and 4 united; funicle joints 2 to 5 submoniliform, but still a 
little longer than broad. All legs (except coxae) and antennae 
honey-yellow, flagellum and femora a little darker; claw of stigmal 
club straigth, given off well before tip of club; pilosity sparse. 
Male. — The only males which I have seen are the two from 
the Harris collection. These are both in very bad condition; 
neither has an abdomen and one has no antennae. With the other 
but three funicle joints remain on the left antenna (the others 
being broken off) and four on the rigth, but the latter are still 
inclosed in the pupal sheath. The three funicle joints remaining 
on the left antennae are not pedicellate, very slightly arched 
above, and furnished with close, moderately short hair not arranged 
in whorls; joint 1 longest, 2 and 3 successively decreasing. Joint 4 
is still shorter, judging from the sheathed right antenna.“ 
Harris (7) hatte die Spezies als /chneumon hordei beschrieben 
und sie für den Parasiten einer Cecidomyide unbekannter Art ge- 
halten, die durch ihr Massenauftreten an Gerste und Weizen in 
verschiedenen Staaten Nordamerikas erheblichen Schaden an- 
gerichtet haben sollte. Die gleiche Angabe findet sich auch bei 
Walker (19), dem der Autor Exemplare zur Begutachtung über- 
sandt hatte. Er gibt folgende Beschreibung des Männchens, das 
ihm vermutlich allein vorgelegen hat: 
„Isosoma hordei (Harris MSS.), Mas. Atrum, antennae nigrae, 
pedes fulvi, femora piceo-vittata, tarsi flavi, alae limpidae. 
Corpus atrum, convexum, angustatum, sublineare, parum 
nitens, scite punctatum, parce hirtum: caput transversum, breve, 
thorace vix latius; vertex latus; frons impressa, abrupte declivis: 
oculi picei, mediocres, non extantes: antennae nigrae, pubescentes, 
filiformes, graciles, corpore breviores: thorax fusiformis: pro- 
thorax magnus, transversus: mesothoracis scutum longitudine 
latius; parapsidum suturae bene determinatae, postice approxima- 
tae; scutellum subconicum: metathorax sat magnus, declivis, 
obconicus: petiolus sat longus: abdomen sublineare, nitens, laeve, 
thoracis brevius; segmentum lum et 2um magna: pedes fulvi, 
simplices, subaequales; coxae nigrae; femora piceo-vittata; tarsı 
flavi, apice fusci: alae limpidae; squamulae piceae; nervi fulvi; 
nervus humeralis ulnari duplo longior, radialis ulnari multo brevior 
cubitali vix longior, cubitalis sat longus; stigma minutum. (Corp. 
long. lin. 114 ; alar.. lin. 2.)“ 
Diese Diagnose stimmt mit der oben wiedergegebenen in den 
von beiden Beschreibern gemeinsam herangezogenen Punkten 
11. Heft 
